I have looked at the projects page,and think I understand the position when you have 3 sets of wires. I took off my old rose (without labelling the wires) and I have 4 sets of wires coming from the ceiling. The earths are connected to each other (2-2) and I recollect that 3 of the reds were connected together, but not to the light fitting itself. The new light fitting only requires one live and one neutral to be connected. What next?